8
危
险
！
CAUTION
6. Vacuum
Pumping
and
Charging
Refrigerant
·
Vacuum
P
umping
Charge Hose
(for R410A)
Installation
I
nstructions
(1)
Remove the service port cap of the stop valve on the gas pipe
side of the outdoor unit.
(2)
Connect the manifold gauge and vacuum pump to the service port
of the stop valve on the gas pipe side of the outdoor unit.
(3)
Run the vacuum pump. (
Let it work
for
at least
15 minutes.)
(4)
Check the vacuum with the gauge manifold valve, then close the
gauge manifold valve and stop the vacuum pump.
(5)
Leave it as
-
is for one or two minutes. Make sure the pointer of the
manifold gauge remains in the same position. Confirm that the
pressure gauge shows
-
14.7 psig (-0.101MPa or -760mmHg).
(6) Remove the manifold gauge quickly from the service port of the stop
valve.
(7) After refrigerant pipes are connected and evacuated, fully open
all stop valves on both sides of gas pipe and liquid pipe.
(8) Open adjusted valve to add refrigerant
(
refrigerant
must be
liquid
).
(9) Tighten the cap to the service port .
(10)
(11)
Re-tighten the cap.
Leak/foam test with halogen leak detector to check the flare nut and
brazing points of leak. Use foam that does not generate ammonia
(NH3) in the reaction.
Indoor Unit
Outdoor Unit
Manifold
Valve
Pressure
Gauge
Vacuum
Pump
Fig.9.2
Turn
the cylinder upside-down when filling.
Stand the cylinder upright when filling.
There is a siphon pipe inside,so the
cylin
d
er
need not
be upside-down to fill with
liquid.
Filling
Using
a
C
ylinder with an
A
ttached
S
iphon
Filling
with
O
ther
C
ylinders
·
An
excess
or
a
shortage
of
refrigerant
is
the
main cause
of
issues
with
the
unit
.
Charge
the
correct
refrigerant
quantity
according to
the
description
of
label
at
the
inside
of
the
manual
.
·
Check
for
refrigerant
leakage
in
full detail
.
If
a
large refrigerant
leakage
occurs
,
it
can result in difficulty
breathing
for
inhabitants, and/
or
harmful
gases
can
occur
if
a
source of
fire
is
used
in
the
room
.
·
Additional R
efrigerant
C
harge
The unit has been pre-charged with refrigerant.
Please refer to “Piping Requirement” to calculate the additional charge.
After vacuum pump procedure has finished, first exhaust air
from the charge hose, next open
the
valves.
Charge refrigerant as “liquid” type through the
l
iquid stop valve.
At the end, close valves
,
and record
the
charged
refrigerant
quantity
.
